Table 2 Linearity for ceftriaxone and ceftriaxone e-isomer.

From: A high-performance thin-layer chromatography densitometric method for the separation of isomeric ceftriaxone in powder for injection formulation

Level

Ceftriaxone sodium (50-150%)

Ceftriaxone (E)-isomer (L1-L6)

Concentration range (ng/spot)

200–600

15–150

Linear regression

Polynomial regression

Linear regression

Polynomial regression

x2 -coefficient

-

-0.0036

-

-0.0132

x- coefficient (Slope)

12.477

15.343

8.323

10.474

y-intercept

965.510

463.980

83.036

26.025

r2

0.997

0.998

0.995

0.999

RSD

0.4

0.3

0.4

0.1

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